pra£si f^^ hal/^ y^:^^ 



Tie.co 



Fig. 161. — Semi-diagrammatic view of anterior part of body of Nereis with 

 dorsal wall removed so as to show alimentary canal, oes, int ; the septa ; 

 blood-vessels (dors, vess, vent, vess.) ; and the nephridia (neph). Behind, 

 intestine removed to show ventral blood-vessel and nerve cord (ne. co) ; gl, 

 glands of esophagus ; para, swimming feet ; perist, peristome ; perist. tent, 

 tentacles of the peristome ; ph, pharynx and its jaws ; praest, part of head 

 lying above mouth. From Parker and Haswell. 



105 



